Thrilling cast vacated theatre circle (8)
I believe the answer is:
electric
'thrilling' is the definition.
(thesaurus)
'cast vacated theatre circle' is the wordplay.
'cast' indicates anagramming the letters.
'vacated' says to hollow out the word (remove centre letters).
'theatre' with its centre taken out is 'te'.
'te'+'circle'='tecircle'
'tecircle' with letters rearranged gives 'ELECTRIC'.
(Other definitions for electric that I've seen before include "sort of guitar?" , "Tense" , "stirring" , "Type of chair, hare, shock etc" , "Emotionally charged" .)